Cluster-based cooperative jamming in wireless multi-hop networks

This paper proposes a cluster-based optimal relay and jammer selection (CB-ORJ) scheme to deal with interception and improve the secrecy rate in wireless multi-hop networks in the presence of both intra-cluster and inter-cluster eavesdroppers. We first present a novel mathematical model of cluster-based secure transmission. Furthermore, we propose an on-demand relay and jammer selection approach based on the proposed model with power allocation to optimize the secrecy rate subject to a total transmit power constraint under different security requirements. To confuse the intra-cluster eavesdroppers, the cluster heads assign appropriate cluster members as jammers, while for the inter-cluster eavesdroppers, the transmitting cluster and the receiving cluster jointly select their cluster members as jammers. Finally, simulation results demonstrate that our scheme outperforms existing ones in terms of secrecy outage probability (SOP) while guaranteeing a lower desired energy consumption.